To avoid hang I had to boot with video=atyfb:off
I am not using the kernel fbdev.

With this I can now use X: -

Section "Device"
        Identifier      "ATI Technologies 3D Rage Pro or similar (ATY,RageXL)"
        Driver          "ati"
        BusID           "PCI:0:19:0"
        Option "ReferenceClock" "29.500Mhz"
EndSection

Does "29.500 MHz" need to be misspelt "29.500Mhz"?

http://comerford.cc/wordpress/ubuntu-on-sun-blade-100150-issues-problems-configuration/
> After a lot of research I finally came across a post on the Ubuntu
> forums, it was for a Sun Blade 100 but the PGX64 card (which is ATI
> Rage based) was the same. The post contained the crucial information
> needed to remedy the problem, a line
> (Option "ReferenceClock" "29.500Mhz")
> had to be added to the Device section of the /etc/X11/xorg.conf
> configuration file:
> 
> Section "Device"
> Identifier "ATI Technologies, Inc. Rage XL"
> Driver "ati" BusID "PCI:0:19:0"
> Option "UseFBDev" "true"
> Option "ReferenceClock" "29.500Mhz"
> EndSection
> 
> Once that _ReferenceClock_ option had been added, the X Server came up
> and displayed without a hitch. Given how hard it was to find the
> solution, I thought the blog post was warranted and now given the hits
> I've started this page. Hopefully people will find it useful.


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